If the Ricardo-Barro effect occurs, an ________ in saving finances the government budget deficit and the real interest rate ________

Refer to the above table. Assuming that opportunity costs are constant, the opportunity cost of producing a bicycle in the United States is equal to ________, and the opportunity cost of producing a bicycle in Mexico is ________

A) 4 computers; 0.5 computer B) 0.25 computer; 2 computers C) 2.67 bicycles; 0.33 computers D) 0.375 computer; 3 bicycles

Which of these statements about economic models is correct?

a. For economists, economic models provide insights about the world. b. Economic models are built with assumptions. c. Economic models are often composed of equations and diagrams. d. All of the above are correct.